Log Message:
Update ruby-puma to 2.11.1.

pkgsrc changes:

* Add pkg_alternatives support.
* Add ${GEM_EXTSDIR}/gem.build_complete for new rubygems and updated ruby.

=== 2.11.1 / 2015-02-11

* 2 bug fixes:
  * Avoid crash in strange restart conditions
  * Inject the GEM_HOME that bundler into puma-wild's env. Fixes #653

* 2 PRs merged:
  * Merge pull request #644 from bpaquet/master
  * Merge pull request #646 from mkonecny/master